Monodisperse microgel latex with homogeneous cross-link density distribution within the particles was prepared by feeding the monomer and cross-linker into the reaction mixture in a regulated way during the polymerization. To determine the appropriate monomer feeding parameters, the kinetics of the particle formation was investigated by HPLC. The swelling and optical characteristics of the prep...

Molecular imprinting is an emerging technique for preparing artificial antibodies that have potential applications in affinity-based separations, biomimetic sensors and assays. The conventional imprinting methods either deliver a monolith that is mechanically ground to irregular particles — a time-consuming process with low yield, or involves complicated polymerization process by which spherica...

We report a new surface modification approach of upconversion nanoparticles (UCNPs) structured as inorganic hosts NaYF4 codoped with Yb(3+) and Er(3+) based on their encapsulation in a two-stage process of precipitation polymerization of acrolein under alkaline conditions in the presence of UCNPs. The use of tetramethylammonium hydroxide both as an initiator of acrolein polymerization and as an...

Nanospheres of poly(methacrylic acid-grafted-poly(ethylene glycol)) were prepared by solution/precipitation polymerization. As colloidal drug delivery carriers, they present unique properties that render them promising candidates for oral protein delivery. The polymerization was carried out in water and the resulting suspension was freeze-dried. As with many colloidal systems, the freeze-dried ...

Microparticles or nanospheres of hydrogels of crosslinked poly(methacrylic acid) grafted with poly(ethylene glycol) as well as crosslinked poly(acrylic acid) grafted with poly(ethylene glycol) were prepared for use as oral insulin delivery carriers. The copolymer carriers were synthesized by precipitation/dispersion polymerization that led to gel nanospheres or by bulk polymerization and subseq...

The molecularly imprinted polymers for gallic acid were synthesized by precipitation polymerization. During the process of synthesis a non-covalent approach was used for the interaction of template and monomer. In the polymerization process, gallic acid was used as a template, acrylic acid as a functional monomer, ethylene glycol dimethacrylate as a cross-linker and 2,2'-azobisisobutyronitrile ...

ABSTRACT: The effect of adding diethyl zinc as a chain transfer agent during the polymerization propylene in heptane performed at 80 °C was studied. Although it expected that the transfer would stop after precipitation polymer, the polymer molecular weight continued to increase throughout the whole polymerization. presence had an additional that polymerizations were devoid reactor fouling. To u...

heterogeneous polymerization of vinylidene fluoride (VDF) has been investigated in scCO2 in the presence of different perfuoropolyether surfactants using DECP as free radical initiator. When carboxylate perfluoropolyether was used higher monomer conversions were obtained with respect to precipitation processes. PVDF was collected at the end of the process under the form of a white powder and SE...

Fibrinogen altered by thrombin-catalyzed liberation of fibrinopeptide A was found to combine with native fibrinogen to form a cold-precipitable complex we have called "cryoprofibrin." The altered fibrinogen lacking fibrino-peptide A polymerized into fibrin, but not until conditions for equilibrium between its incorporation into both cryoprofibrin and fibrin were satisfied. At equilibrium, the c...